Cesar - 8 months ago 42

MySQL Question

I know that with a LIMIT at the end of a SQL statement, like this:

`SELECT * FROM books WHERE 1 LIMIT 3`

it will show at most 3 items from table

`books`

Now imagine that we have a field,

`category`

`SELECT * FROM books WHERE category IN (1, 3, 5) LIMIT 3`

I will get those rows with category with values 1 OR 3 OR 5, and again a limit of rows of 3.

How can I get a limit of 3 for each category? (outline of basic idea)

`SELECT * FROM books WHERE category IN (1, 3, 5) LIMITS (3, 3, 3)`

Answer

You could do this with a `UNION`

:

```
(SELECT * FROM books WHERE category = 1 LIMIT 3)
UNION
(SELECT * FROM books WHERE category = 3 LIMIT 3)
UNION
(SELECT * FROM books WHERE category = 5 LIMIT 3)
```